You probably won't do a backflip over a flight of stairs in real life, but you'll do it on your Android phone. And you'll stay organized. And you'll send lewd pictures that expire in three seconds to your friends. Or at least you will if you're checking out this round of the apps of the week.

SwiftKey 4: SwiftKey is a really good Android keyboard replacement. The newest version introduces something called Flow, which lets you slide to the space bar so you don't have to pause your typing, ever. $2